Aluminium alloy.



UNITED STATES PATENT OFFICE.

ERNST MURMANN, OF VIENNA, AUSTRIA-HUNGARY.

, v ALUMINIUM ALLOY.

SPECIFICATION forming part of LettersPatent No. 699,216, dated May 6, 1902.

ject of the Emperor of Austria-Hungary, re-

siding at 1 L Kettenbriickengasse, Vienna, Austria-Hungary, have invented certain new and useful Improvements in Aluminium and Brass Alloys, of which the following is a specification. v j

This invention relates .to an aluminium alloy which owing to the readiness with which it lends itself to further treatment or manipulation will prove a preminently workable metal in those'c'ases where no importance is attached to the alloy attaining its maximum of lightness.

. In preparing the alloy brass containing either from twenty to eighty parts of copper or from eighty down to twenty parts of zinc is added to the aluminium. By this addition of brass, which should be comprised somewhere between the limits of from five to thirtyfive parts to every one hundred parts of aluminium, a good workable alloy will be obtained;

With an addition of brass of from five to ten parts the alloy will be capable of being laminated and wiredrawn.

With an addition of at least ten parts of brass the alloy will reach the point at which it is vworkable with a file and with cuttingtools with a markedly better effect than before, while this workability will attain its Where it is desired to produce soft and cheap Application filed August 14, 1900. Serial No. 26,833- (No specimens.)

material, the alloy is made richer in zinc and soft, and it will be impossible neatly or finely to work same with cutting-tools, as is the case with aluminium and copper alloys.

The alloy best suited to most purposes consists of one hundred parts of aluminium, thirteen parts of copper, and seven parts of zinc, or, in other words, twenty parts of brass. An excellent alloy is yielded by a composition of forty-eight molecules of aluminium, one mole cule ofcopper, and one molecule of zincthat is to say, one hundred parts of alumini um, 9.81 parts of copper, and 10.1 parts of zinc.

Greater density may be imparted to the alloy bycooling it rapidly, also by superadding predetermined quantities of calcium, barium, and strontium to the alloy.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is I An aluminium alloy consisting of one hundred parts of aluminium to three to sixteen parts of copper to twelve to two parts of zinc, the amount of zinc being twice the amount of copper, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

- ERNST MUBMANN'.

WVitnesses:

o. B. HURST, ALvEsTo S. HOGUE. 

